Lock shackle



FIG. 1 is a top view of a lock shackle;

FIG. 2 is a side view of the lock shackle shown in FIG. 1, wherein each side is a mirror image of the other;

FIG. 3 is a front view of the lock shackle of FIG. 1, wherein the front view and the back view are mirror images of each other; and,

FIG. 4 is a bottom view of the lock shackle of FIG. 1.

The portions of the Figures shown in broken lines are for illustrative purposes only, and form no part of the claimed design. 

The ornamental design for a lock shackle, as shown and described. 